Journal Article10.1021/CG025529H
Preparation and Structural Evaluation of the Conformational Polymorphs of α-[(4-Methoxyphenyl)methylene]-4-nitrobenzeneacetonitrile
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TL;DR: In this article, X-ray crystallography of α−[(4-methoxyphenyl)methylene]-4-nitrobenzeneacetonitrile (C16H12O3N2) is shown to exist in three polymorphic trans forms (I−III) and one cis configuration (IV).
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Abstract: Crystals of α−[(4-methoxyphenyl)methylene]-4-nitrobenzeneacetonitrile (C16H12O3N2) are shown by X-ray crystallography to exist in three polymorphic trans forms (I−III) and one cis configuration (IV). Calorimetric studies show that at low temperature form I is thermodynamically the most stable phase, followed by form III and form II. On heating, form III undergoes a phase transformation to form II. There is no direct thermal transformation between forms II and I. Form I melts at 164.5 °C. Mechanical damage of form II initiates a phase transformation into form III, and structural studies confirm that forms II and III, both of which show attractive second-order nonlinear optical behavior, are closely related. Though clearly conformational polymorphs, they also exhibit the essence of orientational polymorphism. Although form I is the most stable of the three trans isomers, nevertheless forms II and III are indefinitely stable and may be useful for development for NLO purposes. Crystal growth studies show that...
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Citations
Polymorphism in 3-methyl-4-methoxy-4′-nitrostilbene (MMONS), a highly active NLO material
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Nonlinear polarimetry of molecular crystals down to the nanoscale
Sophie Brasselet,Joseph Zyss +1 more
TL;DR: Brasselet et al. as discussed by the authors survey and discuss some ongoing developments in this domain within our laboratory, with special emphasis on polarization dependent tensorial properties read-out at submicron scale, to be exploited towards a better understanding of nanostructured architectures, ordering and dynamical crystallization properties of a variety of samples, down to the spatial resolution of two-photon nonlinear confocal microscopy.
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trans-3-(3,4-Dimeth-oxy-phen-yl)-2-(4-nitro-phen-yl)prop-2-ene-nitrile.
TL;DR: The asymmetric unit of the title compound, C17H14N2O4, contains two independent molcules in which the benzene rings are in a trans arrangement with respect to the C=C double bond and the rings are inclined by 4.3
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Thermally Stable Imines as New Potential Nonlinear Optical Materials
V. V. Nesterov,Mikhail Yu. Antipin,Vladimir N. Nesterov,Benjamin G. Penn,and Donald O. Frazier,Tatiana V. Timofeeva +5 more
TL;DR: In the search for new thermostable acentric nonlinear optical (NLO) crystalline materials, several polar imine derivatives with the general structure D-π-A(D) were synthesized and studied as discussed by the authors.
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Evidence for Nonpolar Alignment of [NbOF5]2- Anions in Cd(pyridine)4NbOF5 Chains
Paulette C. R. Guillory,Janet E. Kirsch,Janet E. Kirsch,Heather K. Izumi,Charlotte L. Stern,Kenneth R. Poeppelmeier +5 more
TL;DR: In this paper, a new phase of Cd(py)4NbOF5 (py = pyridine) (A) is a rare example of a mixed metal oxide fluoride in an ordered linear chain structure.
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